Revert of [polymer] - Sort series data before adding to legend. (patchset #1 id:1 of https://codereview.chromium.org/2233763003/ )
Revert of [polymer] - Sort series data before adding to legend. (patchset #1 id:1 of https://codereview.chromium.org/2233763003/ )

Reason for revert:
This sorts the legend, but not the underlying graph data. It's leading to miss-matches between what people select and what graphs get shown.

BUG=catapult:#2701

Original issue's description:
> [polymer] - Sort series data before adding to legend.
>
> Demo deployed: https://clean-simonhatch-1dffaf54-dot-chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICghs24qQkM
>
> R=aiolos@chromium.org
> BUG=catapult:#2558
>
> Committed: https://chromium.googlesource.com/external/github.com/catapult-project/catapult/+/76ba893246e3a5331793b91278d0aeb3b3c16313

TBR=simonhatch@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=catapult:#2558

Review-Url: https://codereview.chromium.org/2294873003

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